An inductor of inductance 80mH, 500 A at 60 Hz needs to be designed. But my area product is coming too high. Probably because of VA rating. Due to this I can't find a suitable core that matches its Ap. Please help me with calculations of Ap. Is there something I am doing wrong? My voltage comes out to be 15kV approx. VA rating comes too high which enlarges the Ap value = (VAe4)/Bm*f*Ku*Kf*J. Also how to select appropriate J value (current density)?